Resources For You

  1. 5 Essential Marketing Strategies for VoIP Businesses

    5 Essential Marketing Strategies for VoIP Businesses

  2. 5 Technologies Set to Revolutionise Webphones

    5 Technologies Set to Revolutionise Webphones

  3. 5 Unique Types of VoIP Gateways Explained!

    5 Unique Types of VoIP Gateways Explained!

  4. 5 Ways a Cloud PBX System Benefits Remote Work

    5 Ways a Cloud PBX System Benefits Remote Work

  5. 5 Ways SBCs Facilitate Unified Communications as a Service

    5 Ways SBCs Facilitate Unified Communications as a Service

  6. 5 Ways to Optimise ASR To Grow Profitability

    5 Ways to Optimise ASR To Grow Profitability

  7. 7 Additional Important Components of a VoIP Carrier Network Explained

    7 Additional Important Components of a VoIP Carrier Network Explained

  8. 7 Important Factors to Consider When Implementing LCR

    7 Important Factors to Consider When Implementing LCR

  9. 7 Ways to Optimize AHT

    7 Ways to Optimize AHT

  10. 9 Key Functions of an SBC Explained

    9 Key Functions of an SBC Explained

  11. 10 Factors to Consider While Choosing a Webphone

    10 Factors to Consider While Choosing a Webphone

  12. 10 Important Components of a VoIP Carrier Network Explained

    10 Important Components of a VoIP Carrier Network Explained

  13. 10-Point Security Checklist for VoIP Carriers

    10-Point Security Checklist for VoIP Carriers

  14. 10 Tips For Effective Implementation of LCR

    10 Tips For Effective Implementation of LCR

  15. 10 Webphone Features that Benefit Your Business

    10 Webphone Features that Benefit Your Business

  16. An Out of the Box Telecoms Network

    An Out of the Box Telecoms Network

  17. Are Call Centers Still Relevant in 2023?

    Are Call Centers Still Relevant in 2023?

  18. Automated Dialler vs Manual Dialler - Knowing the 7 Key Differences

    Automated Dialler vs Manual Dialler - Knowing the 7 Key Differences

  19. Call Center vs Contact Center - Understanding the Differences

    Call Center vs Contact Center - Understanding the Differences

  20. Choosing SIP over TCP,TLS and UDP in 2022

    Choosing SIP over TCP,TLS and UDP in 2022

  21. Class 4 Softswitch vs Class 5 Softswitch - Understanding the Difference

    Class 4 Softswitch vs Class 5 Softswitch - Understanding the Difference

  22. Combatting Covid-19 with Carrier-Grade Communications Solutions to Help Users Work Remotely

    Combatting Covid-19 with Carrier-Grade Communications Solutions to Help Users Work Remotely

  23. Comprehensive Cloud Softswitch Documentation

    Comprehensive Cloud Softswitch Documentation

  24. ConnexCS expands AnyEdge SIP Load Balancer to India

    ConnexCS expands AnyEdge SIP Load Balancer to India

  25. ConnexCS for Africa

    ConnexCS for Africa

  26. ConnexCS WebPhone SDK Connector

    ConnexCS WebPhone SDK Connector

  27. Discover the Different Types of NAT: An Essential Guide for Network Administrators

    Discover the Different Types of NAT: An Essential Guide for Network Administrators

  28. Discussing the Future and Top 9 Benefits of WebRTC

    Discussing the Future and Top 9 Benefits of WebRTC

  29. DNO And DNC Lists - Everything Carriers Should Know

    DNO And DNC Lists - Everything Carriers Should Know

  30. Email and SMS Alerts

    Email and SMS Alerts

  31. Employers' Guide to Winning at Remote Work

    Employers' Guide to Winning at Remote Work

  32. Exploring the Top 10 Types of Web Phones in 2023!

    Exploring the Top 10 Types of Web Phones in 2023!

  33. False Answer Supervision Detection - The Ultimate Tool for Preventing VoIP Fraud

    False Answer Supervision Detection - The Ultimate Tool for Preventing VoIP Fraud

  34. Far-End NAT Traversal - An In-Depth Guide

    Far-End NAT Traversal - An In-Depth Guide

  35. Feature Releases for June 2024

    Feature Releases for June 2024

  36. From Cost Savings to Mobility - 15 Benefits of Web Phones for Businesses

    From Cost Savings to Mobility - 15 Benefits of Web Phones for Businesses

  37. Get Your FCC Registration Number in 5 Easy Steps!

    Get Your FCC Registration Number in 5 Easy Steps!

  38. How to Build Your API on ConnexCS

    How to Build Your API on ConnexCS

  39. How to Build Your Own Dialer (BYOD) – Part 1

    How to Build Your Own Dialer (BYOD) – Part 1

  40. How to Establish a VoIP Interconnect in 10 Easy Steps

    How to Establish a VoIP Interconnect in 10 Easy Steps

  41. How to Get Operating Company Number (OCN) in 4 Easy Steps

    How to Get Operating Company Number (OCN) in 4 Easy Steps

  42. How to Identify Robocall Scam Traffic - A Comprehensive Guide for Telecom and VoIP Operators

    How to Identify Robocall Scam Traffic - A Comprehensive Guide for Telecom and VoIP Operators

  43. How to Improve CX? Ensure your Call Center Agents are Happy!

    How to Improve CX? Ensure your Call Center Agents are Happy!

  44. How to Prepare for a VoIP Network Security Audit

    How to Prepare for a VoIP Network Security Audit

  45. How to Properly Prepare for Setting up a VoIP Interconnect

    How to Properly Prepare for Setting up a VoIP Interconnect

  46. How to Register for the Robocall Mitigation Database: A step-by-step guide!

    How to Register for the Robocall Mitigation Database: A step-by-step guide!

  47. How to Successfully Implement LCR is 5 Easy Steps

    How to Successfully Implement LCR is 5 Easy Steps

  48. How Using Web Phones Can Benefit These 10 Industries?

    How Using Web Phones Can Benefit These 10 Industries?

  49. Importance of Balancing Cost Minimization and Reliable Call Quality when implementing LCR

    Importance of Balancing Cost Minimization and Reliable Call Quality when implementing LCR

  50. Introducing ConnexCS WebPhone

    Introducing ConnexCS WebPhone

  51. Introducing ConneXML - The Best TwiML Alternative

    Introducing ConneXML - The Best TwiML Alternative

  52. Introducing Smart CLI Select - An Effective Way to Improve your ASR

    Introducing Smart CLI Select - An Effective Way to Improve your ASR

  53. LTE vs VoLTE: Diving Into The Differences

    LTE vs VoLTE: Diving Into The Differences

  54. Operating Company Numbers (OCN) - Understanding Function, Importance and Relevance

    Operating Company Numbers (OCN) - Understanding Function, Importance and Relevance

  55. Populating Our Support Area With Cloud Softswitch Video Guides

    Populating Our Support Area With Cloud Softswitch Video Guides

  56. Predictive Dialler vs Progressive Dialler - Understanding the Differences

    Predictive Dialler vs Progressive Dialler - Understanding the Differences

  57. Preview Dialler vs Power Dialler - Understanding Top 5 Differences

    Preview Dialler vs Power Dialler - Understanding Top 5 Differences

  58. Rate Card Profit Assurance

    Rate Card Profit Assurance

  59. Redundant Redundancies (Backups of backups)

    Redundant Redundancies (Backups of backups)

  60. Revolutionise Your Outbound Calls - 8 Types of VoIP Diallers Explained

    Revolutionise Your Outbound Calls - 8 Types of VoIP Diallers Explained

  61. Scalability – Grow at Speeds That Suit You

    Scalability – Grow at Speeds That Suit You

  62. ScriptForge – Javascript Routing

    ScriptForge – Javascript Routing

  63. Simplifiying our Softswitch Pricing

    Simplifiying our Softswitch Pricing

  64. SIP 101 - The Best Guide of 2022

    SIP 101 - The Best Guide of 2022

  65. The 3CX Supply Chain Attack - Understanding Everything That Happened

    The 3CX Supply Chain Attack - Understanding Everything That Happened

  66. The 5 Best Strategies for Mitigating Robocall Scams

    The 5 Best Strategies for Mitigating Robocall Scams

  67. The Anatomy of Robocall Scams

    The Anatomy of Robocall Scams

  68. The Art of Cost Optimization - Least Cost Routing and Its 7 Benefits

    The Art of Cost Optimization - Least Cost Routing and Its 7 Benefits

  69. The Best Multi-POP Cloudswitch

    The Best Multi-POP Cloudswitch

  70. The Essential Guide to Business Continuity Plans for VoIP Carriers

    The Essential Guide to Business Continuity Plans for VoIP Carriers

  71. The Essential Guide to Implementing STIR/SHAKEN

    The Essential Guide to Implementing STIR/SHAKEN

  72. The Ultimate Guide to STIR/SHAKEN

    The Ultimate Guide to STIR/SHAKEN

  73. Timeout Protections (SIP Ping, SST)

    Timeout Protections (SIP Ping, SST)

  74. TLS and 2FA Security on the ConnexCS Platform

    TLS and 2FA Security on the ConnexCS Platform

  75. Top 5 Alternative Marketing Strategies for VoIP Businesses

    Top 5 Alternative Marketing Strategies for VoIP Businesses

  76. Top 5 Call Center Challenges and How To Overcome Them

    Top 5 Call Center Challenges and How To Overcome Them

  77. Top 5 Important Types of VoIP Gateways Explained

    Top 5 Important Types of VoIP Gateways Explained

  78. Top 7 Strategies For Ensuring Call Quality While Minimizing Costs with LCR

    Top 7 Strategies For Ensuring Call Quality While Minimizing Costs with LCR

  79. Top 9 Indicators that Help You Identify a Bad Carrier

    Top 9 Indicators that Help You Identify a Bad Carrier

  80. Top 10 Points of Differences Between a Traditional and VoIP Carrier

    Top 10 Points of Differences Between a Traditional and VoIP Carrier

  81. Top 10 Types of Robocall Scams Explained!

    Top 10 Types of Robocall Scams Explained!

  82. Top 10 VoIP Vulnerabilities You Must Know About

    Top 10 VoIP Vulnerabilities You Must Know About

  83. Understanding Global RTP Servers (Lowest Latency Possible, High Availability)

    Understanding Global RTP Servers (Lowest Latency Possible, High Availability)

  84. Understanding Network Address Translation (NAT) - A Beginner's Guide

    Understanding Network Address Translation (NAT) - A Beginner's Guide

  85. Understanding the 9 Key Objectives of a VoIP Network Security Audit

    Understanding the 9 Key Objectives of a VoIP Network Security Audit

  86. Understanding the Complete Scope of a VoIP Network Security Audit

    Understanding the Complete Scope of a VoIP Network Security Audit

  87. Understanding the Crucial Role of Session Border Controllers in Carrier-Grade VoIP Networks

    Understanding the Crucial Role of Session Border Controllers in Carrier-Grade VoIP Networks

  88. Understanding VoIP Anycast Load Balancing

    Understanding VoIP Anycast Load Balancing

  89. Understanding What a PBX System is and How it Benefits Your Business

    Understanding What a PBX System is and How it Benefits Your Business

  90. VoIP Carrier Network Components - Understanding Session Border Controllers

    VoIP Carrier Network Components - Understanding Session Border Controllers

  91. VoIP Carrier Network Security - How to Conduct Security Audit?

    VoIP Carrier Network Security - How to Conduct Security Audit?

  92. VoIP Carrier's Ultimate Guide to Cleaning Up Their Traffic

    VoIP Carrier's Ultimate Guide to Cleaning Up Their Traffic

  93. VoIP Interconnects - Learning How VoIP Carrier Connect and Exchange Traffic

    VoIP Interconnects - Learning How VoIP Carrier Connect and Exchange Traffic

  94. VoLTE - An Evolution in Voice Communication

    VoLTE - An Evolution in Voice Communication

  95. WebPones Explained: Understanding Web-Based Telephonic Communication

    WebPones Explained: Understanding Web-Based Telephonic Communication

  96. WebRTC 101 - The Best Guide for Beginners

    WebRTC 101 - The Best Guide for Beginners

  97. What Are SIP Traces - A Beginners Guide

    What Are SIP Traces - A Beginners Guide

  98. What Are The Top 10 Essential Call Center KPIs?

    What Are The Top 10 Essential Call Center KPIs?

  99. What Are VoIP Gateways and How Do They Work? A Comprehensive Guide

    What Are VoIP Gateways and How Do They Work? A Comprehensive Guide

  100. What is a Contact Center and Why Does Your Business Need One?

    What is a Contact Center and Why Does Your Business Need One?

  101. What is Robocall Mitigation Database? A Guide for Carriers and VoIP Operators

    What is Robocall Mitigation Database? A Guide for Carriers and VoIP Operators

VoLTE - An Evolution in Voice Communication

By now we’ve had 5 generations in mobile telecommunication networks. It all started with the First Generation Mobile Network emerging in Japan.

Technologies such as Advanced Mobile Phone Systems (AMPS) and Frequency Division Multiple Access (FDMA) made the first generation of wireless voice communication possible.

The next two generations introduced mobile internet to users and improved its capabilities. However, progress in terms of wireless communication’s core utility, i.e. voice communication remained stagnant.

It wasn’t until the introduction of 4G LTE that we got a big upgrade in terms of voice communication. The upgrade was VoLTE.

We’re going to discuss VoLTE in detail in this blog and understand how it works and what improvements it got us.

Let’s begin now, shall we?

What is Voice over Long Term Evolution (VoLTE)?

Voice over LTE

VoLTE is based on the IP Multimedia Subsystem (IMS) architectural framework and enables VoIP communication over the wireless LTE network.

Instead of a traditional voice stream over a GSM network, VoLTE delivers voice in the form of digital data packets over IP via an LTE network.

The benefit? A big upgrade in terms of voice quality, user experience and call stability.

The growing data transfer capabilities of 3G had many interested in implementing VoIP communication using mobile networks. The only hurdle was that 3G was too slow and suffered from high latency.

This meant the 3G wireless networks were not suitable and reliable enough to host a VoIP call between two parties.

However, VoIP over wireless networks became possible with the introduction of 4G LTE networks. The first commercial VoLTE service was launched in Dallas, Texas in 2012. It wasn’t until 2014 though, that VoLTE became a mainstay globally.

Now that you know what VoLTE is we can move on to understanding how it works.

How does VoLTE work?

The concept itself might seem very simple. After all, it's just a VoIP call over the LTE network right? However, VoLTE is far more complicated. There are a lot of things happening in the background to make a VoIP call over LTE possible.

We’ll break down the entire process into steps for a better understanding.

Step one - The caller places a call

A user may dial a number or place a call to one of his contacts. The moment he does that, the phone connects to the nearest cellphone tower on the LTE frequencies.

As it's a VoLTE call, the call request is transferred in the form of a data packet over IP. The cell tower receives the call and begins processing it.

Step two - Cellular Tower processes your call

The cellular tower checks the data packet and acquires all the necessary information to process the call. As with every VoIP-based communication, VoLTE makes use of the Session Initiation Protocol to connect the caller to the intended call recipient.

SIP in itself is an important protocol that enables IP-based communication. While it sounds simple, it involves multiple steps to establish a connection for a VoLTE call.

Step three - Your Call is connected over IP

SIP works its magic and establishes a direct line of communication between the caller and the intended call recipient. The call recipient’s phone is now ringing and the caller has to wait for them to answer their phone.

Step four - Your Call is answered

The intended caller answers their phone and now the bidirectional transfer of voice data can begin. Before VoLTE, voice data was in the form of an analog audio stream and required dedicated channels to make a voice call possible.

In VoLTE, the voice data is transferred in the form of data packets over the internet. This leads to a better user experience and higher audio quality.

For telecom operators, this capability means they can handle more calls through every telecom tower they have.

With this, you know how VoLTE works. We will now move on to understanding the benefits of VoLTE.

Top 5 Benefits of VoLTE

While there are many technical benefits of VoLTE, we’ll only look at the benefits the end consumers benefit the most out of.

Superior Call Quality

Technologies such as 2G and 3G allow seamless calls but lack tremendously in terms of audio quality. This in part is because of the data transmission throughput capabilities of the two mentioned technologies.

4G on the other hand is capable of 3X and 6X data throughput compared to 3G and 2G respectively. Being able to transmit more data translates into higher audio quality.

Moreover, the connections are more stable compared to legacy ones as they are based on IP. These improvements result in far superior call quality and user experience.

Improved Battery Life

Calling without VoLTE enabled means your smartphone will switch from the 4G network to 3G or 2G to make the call. Once the call is complete, your smartphone needs to reestablish the connection with the 4G network.

VoLTE Improves Battery Life

Thus, this switching process drains the battery due to the additional workload. As the 4G network is not optimized for direct voice calls, there is no way around this but VoLTE. But once you enable VoLTE, your battery consumption drops significantly.

There are claims that battery life should improve by almost 50%. However, users haven’t reported such gains and some have even countered the claims based on their experience.

Improved Coverage and Better Connectivity

Remember the old days when we had to walk outside to make calls? Or how you’d lose connectivity while in your bedroom? Connectivity was a concern when it came to 2G and 3G technology. They were limited by the spectrum they utilized.

VoLTE and its underlying technology, 4G, operate on the 800MHz spectrum. The 800MHz spectrum offers more coverage compared to the 2G and 3G bands.

VoLTE provides better connectivitiy

The penetrative values on the 4G signal are much higher too. This means you will have 4G connectivity throughout the house, behind multiple walls.

Moreover, 4G can connect calls twice as fast as the previous tech. Thus, carriers can process more calls which means a better user experience for the callers.

Ability to Multitask

Gen Z might not have experienced this but the Millenials know this pretty well. Making a call on 3G meant you would no longer be able to use the internet.

VoLTE enables Multitasking

So if you want to send an important email while on call, share a document, post an update or even take a look at maps, it's not possible with 3G.

With 4G and VoLTE, you can multitask. As VoLTE uses data packets, a call doesn’t take up all of your network bandwidth. You can continue working or use the internet for critical things with VoLTE and 4G.

Video Calling

Direct Video calls were introduced in the days of 3G but were very rudimentary in terms of the user experience and utility they offered. Things changed with the rollout of 4G and VoLTE.

VoLTE enabled better direct Video Calls

While 4G allowed for video calls without VoLTE, it required you to download additional apps such as Skype, Zoom, Google Meet, etc. However, with VoLTE, 4G enabled direct video calling.

By providing an additional data stream in the form of video, VoLTE enabled direct video calling using 4G technology. The utility and user experience offered were on par with any other standalone video calling application.

VoLTE Limitations

Technology has its benefits but also comes along with some limitations. Let us take a look at the limitations VoLTE is subject to.

Both Devices need to be VoLTE compatible

For a complete implementation of VoLTE, both devices communicating need to be VoLTE compatible. This was an issue earlier during the initial rollout of VoLTE, however, the market has seen a big influx of VoLTE-enabled devices.

Yet, this is still a concern. There are almost 14 billion mobile devices active in the world and only 4.4 billion of them support 4G and 5G. However, not all of these 4.4 billion devices support VoLTE.

The rollout of VoLTE has been slow in developing and underdeveloped countries.

Network Interoperability

Full network interoperability requires additional setup time and investment in terms of new equipment and its deployment. There are three possibilities for any VoLTE call:

  1. A VoIP-to-VoIP call will remain within the LTE network and is supported using VoIP protocols.
  2. A VoIP to Circuit Switching (CS) call for GSM/WCDMA network will require the help of IMS, application servers and a legacy Mobile Switching Center (MSC) to transfer the VoIP call to legacy networks.
  3. A VoIP to PSTN call will require the IMS to direct it through the PSTN interface to respective exchanges.

Thus, to ensure seamless network interoperability, carriers will have to invest in the required equipment and systems.

Availability of 4G Network

If we consider the entire world, 4G isn’t available in every country. Most developed nations do have a wide-scale 4G network. However, developing and developed nations do not have 4G capabilities yet.

Worldwide 4G coverage

Moreover, not even developed countries enjoy 100% 4G network coverage. Let us check two examples.

4G network coverage in USA

The USA has the best-developed telecom network in the entire world. The US telecom market has always been the first to enjoy leading-edge communication technologies.

However, when we consider this map, large sections of the continental USA still do not have access to 4G networks.

4G Network coverage in China

China is the world leader when it comes to electronics and telecom. The areas marked in red have 4G connectivity. Considering how big China is, the 4G network barely covers half of China’s entire landmass.

So the availability of 4G networks worldwide does pose a limiting factor when it comes to the uptake and widespread use of VoLTE.

Ending Notes

VoLTE has been a promising piece of technology for the good part of the last decade. While we have listed a few limitations to it, those will be dealt with in the coming years.

Legacy networks are being phased out for newer and cost-effective 4G and 5G networks. Once the uptake of 5G gains momentum, Network interoperability and network availability won't be of concern.

In terms of devices, over 90% of all devices sold since 2019 are 4G capable. Looking at recent news, 5G capable smartphones now account for 51% and more in terms of new devices sold. All these devices are VoLTE capable so there goes the last limiting factor.

The day VoLTE takes over is not far away!